(tac_seekable): Store match length in regoff_t, not int. Assume that

negative return values less than -2 represent regoff_t overflow.

diff --git a/src/tac.c b/src/tac.c
index 1786b76..c5fbe24 100644 (file)
--- a/src/tac.c
+++ b/src/tac.c
@@ -255,14 +255,18 @@ tac_seekable (int input_fd, const char *file)
         Otherwise, make `match_start' < `G_buffer'. */
       if (sentinel_length == 0)
        {
-         ptrdiff_t i = match_start - G_buffer;
-         int ret;
+         size_t i = match_start - G_buffer;
+         regoff_t ri = i;
+         regoff_t range = 1 - ri;
+         regoff_t ret;
 
-         if (! (INT_MIN < i && i <= INT_MAX))
+         if (1 < range)
            error (EXIT_FAILURE, 0, _("record too large"));
 
-         ret = re_search (&compiled_separator, G_buffer, i, i - 1, -i, &regs);
-         if (ret == -1)
+         if (range == 1
+             || ((ret = re_search (&compiled_separator, G_buffer,
+                                   i, i - 1, range, &regs))
+                 == -1))
            match_start = G_buffer - 1;
          else if (ret == -2)
            {